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Date:   Tue, 11 Aug 2020 05:53:50 +0530
From:   Sumera Priyadarsini <>
        Sumera Priyadarsini <>
Subject: [PATCH v4] documentation: coccinelle: Improve command example for make C={1,2}

Modify coccinelle documentation to further clarify
the usage of the makefile C variable by coccicheck.

Signed-off-by: Sumera Priyadarsini <>

Changes in v4:
        - Modify commit message to clarify C is a variable
 Documentation/dev-tools/coccinelle.rst | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/Documentation/dev-tools/coccinelle.rst b/Documentation/dev-tools/coccinelle.rst
index 6c791af1c859..74c5e6aeeff5 100644
--- a/Documentation/dev-tools/coccinelle.rst
+++ b/Documentation/dev-tools/coccinelle.rst
@@ -175,13 +175,20 @@ For example, to check drivers/net/wireless/ one may write::
     make coccicheck M=drivers/net/wireless/
 To apply Coccinelle on a file basis, instead of a directory basis, the
-following command may be used::
+C variable is used by the makefile to select which files to work with.
+This variable can be used to run scripts for the entire kernel, a
+specific directory, or for a single file.
-    make C=1 CHECK="scripts/coccicheck"
+For example, to check drivers/bluetooth/bfusb.c, the value 1 is
+passed to the C variable to check files that make considers
+need to be compiled.::
-To check only newly edited code, use the value 2 for the C flag, i.e.::
+    make C=1 CHECK=scripts/coccicheck drivers/bluetooth/bfusb.o
-    make C=2 CHECK="scripts/coccicheck"
+The value 2 is passed to the C variable to check files regardless of
+whether they need to be compiled or not.::
+    make C=2 CHECK=scripts/coccicheck drivers/bluetooth/bfusb.o
 In these modes, which work on a file basis, there is no information
 about semantic patches displayed, and no commit message proposed.

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